Path: utzoo!utgpu!watmath!clyde!att!pacbell!ames!mailrus!bbn!rochester!pt.cs.cmu.edu!andrew.cmu.edu!cfe+
From: cfe+@andrew.cmu.edu (Craig F. Everhart)
Newsgroups: comp.mail.sendmail
Subject: Re: Do I send to "user" or "user@host"?
Message-ID: <8XmBCHy00VsL43Ylxe@andrew.cmu.edu>
Date: 9 Jan 89 15:45:23 GMT
References: <618@ur-cc.UUCP>,
	<370@cwjcc.CWRU.Edu>
Organization: Carnegie Mellon
Lines: 7
In-Reply-To: <370@cwjcc.CWRU.Edu>

Right--(b) is correct, sending to ``user@host''.

Why?  Many philosophical reasons, but one quite pragmatic one: if your delivery
agent gets mail to mail domain ``host'' by dropping it off at the mail relay
``mumble'' (that it found via MX records or some such), then (b) is the only
paradigm that allows the server for the machine ``mumble'' to distinguish
``user@host'' from ``user@mumble''.